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Cingular Wireless is the largest mobile phone company in the United States, with more than 57 million subscribers. The company has the largest digital voice and data network. Cingular's headquarters are in Atlanta, Georgia, United States. In Atlanta, Verizon Wireless outnumbered Cingular tower-wise and customer-wise. Cingular operates a network of multiple technologies. The most widely used of these technologies is called Global System for Mobile Communications, or GSM. On top of their GSM network they run a data network called GPRS (General Packet Radio Service) and an upgrade for faster speeds called EDGE (Enhanced Data rates for GSM Evolution). Cingular supports their legacy TDMA and analog networks; however in March 2006 they announced that these networks would be shut down in 2008. As part of this effort, Cingular will charge a $5 monthly fee to those customers who still use TDMA phones. Former networks include various paging services and the Cingular Interactive division that became Velocita Wireless which was recently purchased by Sprint Nextel.

Among the services that Cingular aggressively promotes is its "Rollover" service, allowing customers to keep unused minutes from month to month on a twelve-month rolling cycle on its popular "Nation" nationwide plans.

Cingular Wireless was formed in 2001 as a joint venture of SBC Communications (now AT&T) and BellSouth (soon to be purchased by AT&T). The joint venture created the nation's second largest carrier. Cingular grew out of a conglomeration of 11 regional companies. These companies include BellSouth Mobility, BellSouth Mobility DCS, Cellular One, Houston Cellular, BellSouth Wireless Data, Southwestern Bell Wireless, Pacific Bell Wireless, Nevada Bell Wireless, Ameritech Cellular, SNET and SBC Wireless. With the exception of Pacific Bell and BellSouth Mobility DCS, the digital network consisted of TDMA Technology. The Pacific Bell and BellSouth Mobility DCS networks used GSM technology on the PCS frequency band (1900 Mhz). In 2002 Cingular began an initiative called "Project Genesis" that involved a GSM/GPRS overlay of the entire wireless network. Project Genesis was completed by the end of 2004.